The Opel Astra H GTC 1.9 CDTI ECOTEC (150 hp) was a popular variant of the Astra H GTC (Grand Tourer Coupe) model, produced from 2007 to 2010 following the facelift of the H generation. Positioned as a mid-range offering within the GTC lineup, it aimed to balance performance and fuel efficiency, appealing to drivers seeking a sporty hatchback with diesel economy. This three-door coupe was a key part of Opel’s strategy to attract a younger demographic to the Astra range, offering a more dynamic alternative to the five-door hatchback and estate versions.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra H GTC (facelift 2007) |
| Type (Engine) | 1.9 CDTI ECOTEC (150 Hp) |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (urban) | 7.4 l/100 km (31.8 US mpg, 38.2 UK mpg, 13.5 km/l) |
| Fuel consumption (extra urban) | 4.9 l/100 km (48 US mpg, 57.6 UK mpg, 20.4 km/l) |
| Fuel consumption (combined) | 5.8 l/100 km (40.6 US mpg, 48.7 UK mpg, 17.2 km/l) |
| CO2 emissions | 154 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.9 sec |
| Acceleration 0 – 62 mph | 8.9 sec |
| Acceleration 0 – 60 mph | 8.5 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 8.9 kg/Hp, 112.8 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 240.6 Nm/tonne |
| Power | 150 Hp @ 4000 rpm |
| Power per litre | 78.5 Hp/l |
| Torque | 320 Nm @ 2000-2750 rpm (236.02 lb.-ft. @ 2000-2750 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | Z19DTH |
| Engine displacement | 1910 cm3 (116.56 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 90.4 mm (3.56 in.) |
| Compression ratio | 17.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 4.3 l (4.54 US qt | 3.78 UK qt) |
| Coolant capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1330 kg (2932.15 lbs.) |
| Max. weight | 1880 kg (4144.69 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 340 l (12.01 cu. ft.) |
| Trunk (boot) space – maximum | 1070 l (37.79 cu. ft.) |
| Fuel tank capacity | 52 l (13.74 US gal | 11.44 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load without brakes | 690 kg (1521.19 lbs.) |
| Length | 4290 mm (168.9 in.) |
| Width | 1753 mm (69.02 in.) |
| Width with mirrors folded | 1804 mm (71.02 in.) |
| Width including mirrors | 2033 mm (80.04 in.) |
| Height | 1435 mm (56.5 in.) |
| Wheelbase | 2614 mm (102.91 in.) |
| Front track | 1488 mm (58.58 in.) |
| Rear track | 1488 mm (58.58 in.) |
| Front overhang | 910 mm (35.83 in.) |
| Rear overhang | 766 mm (30.16 in.) |
| Minimum turning circle | 11.2 m (36.75 ft.) |
| Drivetrain | Front wheel drive |
| Number of gears | 6 |
| Gearbox type | Manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Torsion |
| Front brakes | Ventilated discs, 308 mm |
| Rear brakes | Disc, 264 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
| Tires size | 205/55 R16; 225/45 R17; 225/40 R18 |
| Wheel rims size | 6.5J x 16; 7J x 17; 7.5J x 18 |
Powertrain & Engine Architecture
The heart of the Astra H GTC 1.9 CDTI ECOTEC was the Z19DTH engine, a 1.9-liter inline-four cylinder diesel. This engine was a member of Opel/Fiat’s family of common-rail direct injection diesels. The ‘ECOTEC’ designation signified Opel’s commitment to efficiency and reduced emissions. The Z19DTH featured a turbocharger with an intercooler, boosting power output to 150 hp at 4000 rpm and 320 Nm of torque between 2000 and 2750 rpm. The engine utilized a 16-valve DOHC (Double Overhead Camshaft) valvetrain and a high compression ratio of 17.5:1. The common-rail direct injection system, supplied by Bosch, allowed for precise fuel delivery and optimized combustion. The engine was transversely mounted in the front of the vehicle, driving the front wheels. The six-speed manual transmission was the standard offering, providing a good balance between performance and fuel economy.
Driving Characteristics
The 1.9 CDTI ECOTEC engine provided a respectable level of performance for the Astra H GTC. While not as quick as the petrol-powered variants, the diesel engine’s strong low-end torque made it well-suited for everyday driving and overtaking maneuvers. The 0-60 mph sprint took approximately 8.5 seconds, and the car had a top speed of 130.49 mph. The six-speed manual transmission allowed drivers to keep the engine in its optimal power band. Compared to the higher-output 1.9 CDTI variants (like the 170 hp version), the 150 hp model offered a more relaxed driving experience, prioritizing fuel efficiency over outright performance. The gear ratios were tuned for economy, meaning the engine didn’t feel strained at highway speeds.
Equipment & Trim Levels
The Astra H GTC 1.9 CDTI ECOTEC typically came with a decent level of standard equipment. This included air conditioning, electric front windows, a CD stereo, and alloy wheels. Higher trim levels, such as Sport or Design, added features like climate control, upgraded upholstery, parking sensors, and a multi-function steering wheel. Optional extras included a panoramic sunroof, leather seats, and a more advanced audio system. The interior generally featured a sporty design with supportive seats and a driver-focused dashboard layout.
Chassis & Braking
The Astra H GTC featured a McPherson strut front suspension and a torsion beam rear suspension. This setup provided a good balance between ride comfort and handling. The front brakes were ventilated discs, while the rear brakes were solid discs. ABS (Anti-lock Braking System) was standard. The GTC’s chassis was tuned to provide a more engaging driving experience than the standard Astra hatchback, with slightly stiffer suspension and more direct steering. Stabilizer bars were fitted to both the front and rear axles to reduce body roll during cornering.
Market Reception & Comparison
The Astra H GTC 1.9 CDTI ECOTEC was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and decent performance. However, some reviewers noted that the engine could be a bit noisy compared to some of its rivals. Compared to other trims in the Astra H GTC lineup, the 1.9 CDTI ECOTEC offered a compelling combination of economy and practicality. It was a popular choice for drivers who covered long distances or wanted a car that was both fun to drive and affordable to run. The 1.9 CDTI was often seen as a more sensible alternative to the more powerful, but less economical, petrol-powered models.
Legacy
The Z19DTH engine, while generally reliable, is known to have some potential issues, including turbocharger failure and problems with the diesel particulate filter (DPF), particularly on cars that have spent a lot of time doing short journeys. Regular maintenance, including oil changes and DPF regeneration, is crucial for ensuring the longevity of this powertrain. Today, the Astra H GTC 1.9 CDTI ECOTEC remains a relatively affordable and practical used car. Its fuel efficiency and decent performance continue to appeal to buyers looking for a stylish and economical hatchback. However, potential buyers should be aware of the potential maintenance costs associated with the diesel engine and DPF system.
